Conference Agenda

The talk will summarize key requirements for making optical references from hollow core optical fibres and discuss state-of-the art, comparing them to other emerging technologies for this application. The lasers stabilized to stable fibre interferometers are of interest for a range of applications including frequency metrology, low-noise RF signal generation, or low-frequency (e.g. seismic) sensing.

We report a 10 GHz repetition-rate all-fiber, polarisation maintaining, dual-comb light source delivering 60 fs pulses with energies of a few hundred picojoules at 1550 nm. The system combines electro-optic comb technology with nonlinear fiber broadening, enabling coherent broadband dual-comb operation. This architecture provides unprecedented acquisition times down to the microsecond range. We demonstrate its potential through proof-of-concept experiments in both linear and nonlinear spectroscopy.

The interfacing of optical fibers with materials can lead to greater versatility for measurand detection. In this work, we spliced a single mode fiber to a section of a hollow core fiber. In this structure, a self-written waveguide was fabricated at the hollow core fiber tip using a UV curable polymer, resulting in multiple Fabry-Perot interferometers in a reflection scheme. With the Fourier band-pass method, each interferometer was independently analyzed, and different sensitivities were attained for each interferometer to temperature and humidity, potentiating its simultaneous detection with high sensitivity, resolution and quick response time.

Herein, we present the numerical approach, the manufacturing and the characterisation of multi-core fibers with polarisation-maintaining cores thanks to a layered structure. This architecture was based on the approach of second approximation of Maxwell Garnett effective medium theory, in which the lamellar structure of core was considered as the anisotropic form from the point of view of polarized light pulses. The fibres were manufactured by the stack-and draw technique accompanied by the multi – core aspect on the analytical approach of calculation of distances and size of each core.